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diff --git a/doc/ref/api-compound.texi b/doc/ref/api-compound.texi
index dda2518de..c00f3e9a8 100644
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+++ b/doc/ref/api-compound.texi
@@ -2705,6 +2705,10 @@ memory, private to the structure, divided up into typed fields. A
vtable is another structure used to hold type-specific data. Multiple
structures can share a common vtable.
+When applied to structures, the @code{equal?} predicate
+(@pxref{Equality}) returns @code{#t} if the two structures share a
+common vtable @emph{and} all their fields satisfy @code{equal?}.
+
Three concepts are key to understanding structures.
@itemize @bullet{}